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Novel VN/C nanocomposites as methanol-tolerant oxygen reduction electrocatalyst in alkaline electrolyte.

Huang K, Bi K, Liang C, Lin S, Zhang R, Wang WJ, Tang HL, Lei M - Sci Rep (2015)

Bottom Line: A novel VN/C nanostructure consisting of VN nanoparticles and graphite-dominant carbon layers is synthesized by nitridation of V2O5 using melamine as reductant under inert atmosphere.Moreover, the electrocatalytic performance of VN/C towards oxygen reduction reaction (ORR) in alkaline electrolyte is fascinating.The results show that VN/C has a considerable ORR activity, including a 75 percent value of the diffusion-limited current density and a 0.11 V smaller value about the onset potential with respect to Pt/C catalyst.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Information Photonics and Optical Communications &School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.

ABSTRACT
A novel VN/C nanostructure consisting of VN nanoparticles and graphite-dominant carbon layers is synthesized by nitridation of V2O5 using melamine as reductant under inert atmosphere. High crystalline VN nanoparticles are observed to be uniformly distributed in carbon layers with an average size of ca13.45 nm. Moreover, the electrocatalytic performance of VN/C towards oxygen reduction reaction (ORR) in alkaline electrolyte is fascinating. The results show that VN/C has a considerable ORR activity, including a 75 percent value of the diffusion-limited current density and a 0.11 V smaller value about the onset potential with respect to Pt/C catalyst. Moreover, the excellent methanol-tolerance performance of VN/C has also been verified with 3 M methanol. Combined with the competitive prices, this VN/C nanocomposite can serve as an appropriate non-precious methanol-tolerant ORR catalyst for alkaline fuel cells.

No MeSH data available.


Related in: MedlinePlus

ORR activity (A) and the chronoamperometric response upon adding 3 M MeOH (B) of VN/C catalyst and commercial Pt/C catalyst.
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f4: ORR activity (A) and the chronoamperometric response upon adding 3 M MeOH (B) of VN/C catalyst and commercial Pt/C catalyst.

Mentions: Figure 4 shows the ORR polarization curves and chronoamperometric responses upon adding 3 M MeOH of VN/C electrode with respect to commercial Pt/C electrode. Clearly, VN/C catalyst exhibits a very similar tendency (under a combined kinetic-diffusion control of charge transfer and mass transport) with commercial Pt/C catalyst in O2-sataured 0.1 M KOH electrolyte. The ORR onset potential of VN/C electrode is 0.87 V Vs. RHE (0.11 V smaller than Pt/C electrode), the half-wave potentials of VN/C and Pt/C electrodes are 0.73 and 0.85 V respectively. Meanwhile, the diffusion-limited current density of VN/C electrode is 4.12 mA cm−2 at 1600 rpm, almost 80 percent of that of Pt/C electrode. Figure S4 also indicates the stability of VN/C nanocomposites overmatches that of commercial Pt/C catalysts with a more gradual and limited degeneration. In addition, VN/C electrode shows negligible change in its ORR current density upon adding 3 M methanol at 500 s, while an instantaneous current jump due to the initiation of methanol oxidation reaction (MOR) is observed for Pt/C electrode36. The superior methanol tolerance and considerable ORR activity of VN/C illuminate us its powerful competitiveness of being an alternative for non-precious methanol-tolerant ORR catalyst.


Novel VN/C nanocomposites as methanol-tolerant oxygen reduction electrocatalyst in alkaline electrolyte.

Huang K, Bi K, Liang C, Lin S, Zhang R, Wang WJ, Tang HL, Lei M - Sci Rep (2015)

ORR activity (A) and the chronoamperometric response upon adding 3 M MeOH (B) of VN/C catalyst and commercial Pt/C catalyst.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4477409&req=5

f4: ORR activity (A) and the chronoamperometric response upon adding 3 M MeOH (B) of VN/C catalyst and commercial Pt/C catalyst.
Mentions: Figure 4 shows the ORR polarization curves and chronoamperometric responses upon adding 3 M MeOH of VN/C electrode with respect to commercial Pt/C electrode. Clearly, VN/C catalyst exhibits a very similar tendency (under a combined kinetic-diffusion control of charge transfer and mass transport) with commercial Pt/C catalyst in O2-sataured 0.1 M KOH electrolyte. The ORR onset potential of VN/C electrode is 0.87 V Vs. RHE (0.11 V smaller than Pt/C electrode), the half-wave potentials of VN/C and Pt/C electrodes are 0.73 and 0.85 V respectively. Meanwhile, the diffusion-limited current density of VN/C electrode is 4.12 mA cm−2 at 1600 rpm, almost 80 percent of that of Pt/C electrode. Figure S4 also indicates the stability of VN/C nanocomposites overmatches that of commercial Pt/C catalysts with a more gradual and limited degeneration. In addition, VN/C electrode shows negligible change in its ORR current density upon adding 3 M methanol at 500 s, while an instantaneous current jump due to the initiation of methanol oxidation reaction (MOR) is observed for Pt/C electrode36. The superior methanol tolerance and considerable ORR activity of VN/C illuminate us its powerful competitiveness of being an alternative for non-precious methanol-tolerant ORR catalyst.

Bottom Line: A novel VN/C nanostructure consisting of VN nanoparticles and graphite-dominant carbon layers is synthesized by nitridation of V2O5 using melamine as reductant under inert atmosphere.Moreover, the electrocatalytic performance of VN/C towards oxygen reduction reaction (ORR) in alkaline electrolyte is fascinating.The results show that VN/C has a considerable ORR activity, including a 75 percent value of the diffusion-limited current density and a 0.11 V smaller value about the onset potential with respect to Pt/C catalyst.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Information Photonics and Optical Communications &School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.

ABSTRACT
A novel VN/C nanostructure consisting of VN nanoparticles and graphite-dominant carbon layers is synthesized by nitridation of V2O5 using melamine as reductant under inert atmosphere. High crystalline VN nanoparticles are observed to be uniformly distributed in carbon layers with an average size of ca13.45 nm. Moreover, the electrocatalytic performance of VN/C towards oxygen reduction reaction (ORR) in alkaline electrolyte is fascinating. The results show that VN/C has a considerable ORR activity, including a 75 percent value of the diffusion-limited current density and a 0.11 V smaller value about the onset potential with respect to Pt/C catalyst. Moreover, the excellent methanol-tolerance performance of VN/C has also been verified with 3 M methanol. Combined with the competitive prices, this VN/C nanocomposite can serve as an appropriate non-precious methanol-tolerant ORR catalyst for alkaline fuel cells.

No MeSH data available.


Related in: MedlinePlus